Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe36eb28d6843d0…

MALICIOUS

PDF

45.7 KB Created: 2021-06-11 07:53:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: de5fc5694b0bf98abe57987e2fb75102 SHA-1: 1a27ef2ce9cd89aecf39d759efd1b947ee4ccdc3 SHA-256: 9fe36eb28d6843d0d8fb867570875fcaf0d9758040c0ddd3fa290af833189e4e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which appear to be part of an SEO link farm. The document body and extracted URLs suggest a lure related to game cheats or free in-game currency, which is a common tactic for distributing malware or driving traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/howto-find-people-ingame-in-roblox-cheat-game-hack
    • http://repository.ummy.ac.id//repository/coin-master-levels_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/how-to-get-free-robux-easy_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/easy-ways-to-get-free-robux_GM431946152.pdf
    • http://repository.ummy.ac.id/repository/granny-roblox-free-money_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/free-coins-and-spins-coin-master-2021_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/free-robux-websites-no-human-verification_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/lazy-blocks-com-free-robux_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/free-robux-that-actually-works-2021_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-bit-ly_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/free-robux-website_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/link-for-free-spins-on-coin-master_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/minecraft-java-free-download_GM479516143.pdf
    • http://repository.ummy.ac.id/repository/free-robux-no-download-2021_GM431946152.pdf
    • http://repository.ummy.ac.id/repository/horizon-money-hack-may-2021-roblox_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/coin-master-100-spin-slot_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/free-robux-websites-that-actually-work_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/coin-master-fan_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-facebook_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005201.bin
687f56685aa8eacdd66962d47325f83774afd0c814d3b02d4ff28a83a1d8707d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5201 25080 bytes
font_01_sfnt_off00008bb4.bin
f8a22de496e4be97a3f47f2ad6ddb476e00e61d016fa03f7e0886aaddebed31d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB4 19780 bytes

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